Knife and holder



Jul 15, 1924. 1,501,162

H. A. CUMFER KNIFE AND HOLDER Filed Jag. 50, 192-2 29 /i A? M x g RTZUQNZZOI, 77a Fry/9 Cam r JM 074% Mtg held in the holder as firmly and 'unyield- Ptented .luly l5, i924.-

HAIR-RY A. CUMFER, OFOHICAGO, ILLINOIS, ASSIGNOR TO GUYTON & CUMFER 60., A CORPORATION OF ILLINOIS. I

MFG.

E AND HOLDER.

Application filed January 30,'1922. Serial No. 532,851.

1 all whom it may concern:

Be it known that Library A. CUMFER, a citizen of the United States, residing at Chicago, in the county of'Oook and State of Illinois, have invented certain new and useful Improvements in-Knives and Holders, of which the following is a specification.

This invehtion relates to improvements in knives and holders.

One of the objects of this invention is to provide a knife of such configuration and cooperating holder that the knife will be ingly as if the-knife and holder were of one solid integral piece.

Another object is toprovide a knife having a longitudinally extending cutting edge and relatively short transverse dimensions with a suitable holder of less expensive metal, thereby to economize in the use of the higher priced metal.

- Another ob'ect' is to provide a holder for a relatively long, thin knife which will lateral deflection, or bendingout of a true line.

Another object -is, generally, to improve shearing knives and means for holding and bracing them.

Other objects and advanta I es will hereinafter appear, to persons ski led in the art,

from a consideration of the following description when taken 'in conjunction with the drawings.

In machines in which a pair of cooperating scissors-like knives are used for shear-' ing a'sheet, as in paper cutting machines, it is quite essential that the cutting edges of the knives shall be held in true parallel alignment and, since the steel of which the best knives are made is expensive, economy in structure demands that the knife blades shall be of relatively small dimensions. There are other essentials that must be complied with. The blade must be held rigidly in place so that no part will be deflected in either transverse direction and the bladeholding means, made of a cheaper grade of material,shall be amply stron to withstand the stress and shall have faci ity to firmly grasp and clamp the blade without overlying a very large area of the blade.

Preferably the members of the holding means shall be" independently adjustable: to conform to the character of that part of the blade brought into'contact with the holder part ofthe holder by sliding the blade longl- 'tudinally of its axis after it has been released by the clamping holder.

In the drawing Fig. 1 is a. transverse section thru a part of the machine, .the blade and itsholder. v

Fig. 2 is a brokenaway elevation of the same. x

In both views the same reference characters are emplo ed to indicate similar parts.

.Only one kmfe of a pair of similar knives is shown in which 5 is a part of a machine to which the lower knife 6 is attached and to which it is held by the holder 7 firmly hold the knife and brace itto prevent .16 that register with similar slots or holes in the companion member.

The upper ends of the members 14 and 15 each have a head 18 grooved to admit the head 9 of the clamp and having asurface for contact withthe inclined parts of the knife and abruptly terminating in an end for contact with the shoulders ll'on each side of the knife so that the heads of the holders are wed (1 into the grooves made into the sides 0 the knife blade when the clamping members are drawnv together.

v A series of spaced apart bolts 19 pass thru the slots in the holders 1% and and-are screwed into the machine member 5. To

' extend the pressure exerted by the bolts diadjusted by the bolts 21 which contact the lower edges of both of the clamping members 14 and 15 whereupon the bolts 19 may be further tightened to firmly hold all of the parts in place.-

The shank 8 of the blade is firmly wedged 6 between two parts of each of the holder members, as when the heads of the holder members enter the groove on each side of the blade and the inclined edges at 10 meet, thus forcing very intimate contact under the shoulders 11 of-the knife.

On the outside the washer-20 backs up the head of the outside member at the point of ap, lication of pressure.

aving described my invention what I claim as new and desire to secure by Letters Patent, is: I

1. A device of the character described comprising a relatively long knife blade having a groove in both of its sides in the same plane forming abrupt shoulders at its upper edge and opposite outwardly inclined shoulders; a pair of duplicate clamping members, each having a head to fit in the respective groove on opposite sides and bolts passing t ru said members to wedge the heads thereof into. the grooves.

2. A device of the character 1 described comprising a relatively lon knife blade havlng a groove in both Of'ltS sides in the same plane forming abrupt shoulders at its upper edge and opposite outwardly inclined shoulders throughout the length of the blade; a pair of like clamping members-each having a head to fit in the respective groove and bolts passing thru said members to wedge the heads thereof into the grooves.

3. A device of the character described comprising a relatively long knife blade having a groove in both of its sides each groove forming an abrupt shoulder nearest its cutting edge and an outwardly inclined opposite shoulder in combination with two relatively large separable clamping members having transversely extending spaced apart slots and each member having a head to enter the respective grooves and individually adjustable therein; bolts extending thru the slots to clamp the members together and bolts engaging the bottom ed es of said members to adjust the position 0 said blade.

In testimony whereof I hereunto subscribed my name.

HARRY A. CUMFER. 

